Edge-turning attachment for sewing-machines



(No Model.) I

I ,H. WYNKOOP.

EDGE TURNING ATTACHMENT FOR SEWING MACHINES.

No. 550,311. Patented NovQ 26,1895.

Ill/Ill WITNESSES 0% (5 6Z1 I 41 A; INVENTiR AN DREW BJERAHAM.PHDTOUTHQWASNINGTUNJD.

.Fig. 3 is a View in side elevation of the said UNITED STATES I PATENTOFFICE;

HENRY VVYNKOOP, 0F PHILADELPHIA, PENNSYLVANIA.

EDGE-TURNING ATTACHMENT FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 550,311, dated November26, 1895.

Serial No. 482,344. (No model.)

To all whom it may concern.-

Be it known that I, HENRY WYNKooP,a citizen of the United States,residing in the city and county of Philadelphia, in the State ofPennsylvania, have invented an Improved Edge-Turning Attachment forSewing-Hachines, of which the following is a specification.

It is the object of my invention to provide a device by which the edgesof two pieces of fabric may, as said fabrics are fed toward the needleof a sewing machine, be symmetrically and uniformly turned in betweensaid fabrics, so that when they reach and are operated upon by theneedle they will be secured in such inturned position.

My improved device is of utility in finishing off the cut edges existingupon the inner face of a garment along the lines of the regular seamsformed therein, as well as in numerous other applications.

In the accompanying drawings I show and herein I describe a preferredform of a convenient embodiment of my invention, the particularsubject-matter claimed as novel being hereinafter definitely specified.

Figure 1 is a partly-sectional top plan view of my improved device,sectionbeing supposed in the plane of the dotted line w w of Fig. 2.Fig-2 is acentral vertical longitudinal partly-sectional elevation ofthe device shown in Fig. 1, section being supposed on the line x 00 ofFig. 1 and sight being taken in the direction of the arrows upon saidline.

device, sight being taken from the right-hand side of Fig. 1. p

Similar letters of reference indicate corresponding parts.

In the drawings, A indicates a plate upon which the various devicesconstituting my improved attachment are assembled,the same being adaptedto be secured in adjacency to the needle of a sewing machine, anupturned flange a being formed upon said plate upon that edge of thesame along which the fabrics operated upon travel.

My improved edge-turning device, which is mounted upon the plate A, isadapted to contemporaneously turn inward or toward each other two fabricedges subjected to its action, and, generally stated, said deviceconsists of two mandrels and two curved guides or shapers, one of whichis employed in connection with each of the mandrels.

B is a spring-tongue, of metal, the rear end of which is pivotallyattached to the flange a, at the rear end of the attachment, and b is astud outwardly projecting from said springtongue.

0 C are respectively the upper and lower mandrels, the same being simplystrips of metal of considerable stiffness, secured as to theirrespective rear extremities,respectively, to the upper and lower facesof the stud b, and extending, as to their bodies, forward to thevicinity of the cloth-holding j awsgvhereof hereinafter.

D is a guide or former employed in connection with the mandrel C, saidguide being a strip of metal of considerable stiffness, the

rear end of.which is flat and supported a short distance above and inparallelism with said mandrel, the intermediate portion of which passesin the form'of a spiral curve to the rear of and beneath said mandrel,and the front end of which is flat and exists below and in parallelismwith the front end of said mandrel.

E is a guide or former employed in connection with the mandrel C, saidguide being a reversely-disposed counterpart of the guide D, being astrip of metal of considerable stiffness, the rear end of which is flatand supported a short distance below and in parallelism with saidmandrel, the intermediate portion of which passes in the form of aspiral curve to the rear of and above said mandrel, and the front end ofwhich is flat and exists above and in parallelism with the front end ofsaid mandrel.

The guides or formers D E are free as to their outer ends and areconveniently supported by the attachment of their rear ends,respectively, to the studs (1 e projecting from the spring-tongue B.

As will be understood, a piece of fabric or one of the cut edgesextending along the seam of a garment, fed between the mandrel O andguide or former D at the right-hand end of the device (see Fig. 3) andadvanced toward the left will, as its inner edge encounters the curvedor spiral portion of the guide or former D, be deflected down behind themandrel, and as said fabric in its further ad vance reaches the frontend of the mandrel and former be, by the flat front end of the guide orformer, carried against the under face of said mandrel, so that the edgeof said fabric will be folded back upon itself over the mandrel. Thedistance between the mandrel and former constantly decreases from theright-hand to the left-hand end, Fig. 3, so that when the fabric reachessaid left-hand end it is quite tightly clasped between the former andthe mandrel and a flat fold is formed in it. As will also be understood,a piece of fabric or the other of the cut edges extending along the seamof a garment, contemporaneously fed between the mandrel C and the guideor former E at the right-hand end of the device (see Fig. and advancedtoward the left, will be folded or turned in a direction the opposite ofthat in which the fabric or edge first referred to will be folded thatis to say, as its inner edge encounters the curved or spiral portion ofthe guide or former E, it willbe deflected up behind the mandrel C, andas said fabric in its further advance reaches the front end of themandrel and formerbe,by the flat front end of the guide or former,carried against the upper face of said mandrel, so that the edge of saidfabric will be folded back upon itself over the mandrel. As will beobvious, the fabric edges advanced through the edge-turning devicedescribed will be uniformly and symmetrically inturned toward eachother.

F F are a pair of cloth-holding jaws extendin g through an aperture tain the flange a, the outer ends of which jaws are in line with and infront of the free ends of the mandrels and are adapted to receive andretain the edges of the fabrics, and the inner ends of which arepivotally mounted upon one extremity of a rock-ar1n G, the otherextremity of which is pivotally connected to the plate A by apivot-screw g.

H is a cam mounted for rotation upon the plate A in proximity to saidarm G, the faces of said cam being, as shown, alternately at a greaterand a less distance from its axis.

I is a spring, one end of which is entered in an opening '5 in the plateA, the intermediate portion of which is bent about or around thepivotscrew g and the other extremity of which is carried forward to thefront end of the rock-arm G and entered in an opening in said rock-arm,the function of said spring, which is thus secured upon the screw g andin the hole '2', being to force the rock-arm constantly against the camH referred to. As will be understood, the rotation of said cam willoccasion the reciprocation of the rockarm fabric-holding jaws andfabrics held by said jaws, and the result of the lateral reciprocationof the fabrics as they are fed to the needle is that the stitchingformed by the needle is zigzag, or of the character known asovei-casting. In order to provide for the rotation of said cam I equipit with a toothed boss J, in which engages a pawl j, carried upon thelower end of a hanger-arm L,'the upper end of which is pivotallyconnected to a vertical extension a of the plate A.

Mis a lever, also pivotally mounted upon the vertical extension a of theplate A, one end of which lever is provided with a stud m engaged in aslot P in the hanger-arm L, and the other extremity of which is forkedand adapted for engagement with an adjacent moving portion of thesewingqnaehine. The movement of such moving part of the machineoccasionsthe vibration of the lever M, and through the engagement of thelatter with the hanger-arm L the oscillation of said hangerarm, andtherefore the reciprocation of the pawl, the intermittent rotation ofthe toothed boss and cam, and the reciprocation of the fabric-holdingjaws and fabric. The central portion of the slot Z is straight, but therespective extremities of said slot are curved or exist upon linesconcentric with respect to the axis of the lever M, so that after thestud m of the said lever M has, in its passage through the straightportion of said slot, occasioned the throw of the hangerarm and pawl toeffect a partial rotation of the toothed boss, said stud, by passinginto the curved concentric end of the slot, ceases to occasion movementof the hanger-arm and pawl, and therefore said curved portions preventexcessive throw of the pawl.

N is a wedge-nosed lever, pivotally supported in proximity to thecloth-holding jaws, the front extremity of which is adapted to betemporarily forced between the fabric-holding jaws to occasion theirtemporary separation to receive the fabric. Said jaws, upon thewithdrawal of the lever, automatically close together and clasp thefabric.

111 order to secure the edges, inturned as described by my duplexedge-turning device, by overcasting stitching, the said edge-turningdevice is so mounted and applied that it has lateral movement in unisonwith the lateral movement of the fabric-holding jaws. As stated and asshown in the drawings, said duplex inturning device is mounted upon aspring-tongue B, and the said spring-tongue is provided, as shown inFig. 1., with a connecting-link 0, one end of which is secured to saidspring-tongue and the other end of which is secured to the rock-arm, byvirtue of which arrangement it results that as the rock-arm isreciprocated to occasion the lat eral movement of the jaws, the saidinturning device will also, by said rock-arm through the link 0, belaterally moved in and out at the same time. The inner end of the saidlink or bar 0 is not fixedly attached to the rock-arm, but is providedwith a downturned end which is simply engaged between the rock-arm G andthe spring I.

\Vhen it is not desired to use the edge-inturning device, said devicemay upon the withdrawal of the inner end of the link 0 from between therock-arm and its spring be rotated.

IIO

, ent

1. The combination to form a duplex edge turning device, of a pair ofmandrels and a pair of guides or formers, said guides or formers beingfiat as to their rear ends, curved as to their intermediate portions,and fiat as to their front ends, and supported in such positions thattheir front ends are between and their rear ends exterior to saidmandrels, substantially as set forth.

2. In combination, a pair of fabric holding jaws, means for occasioningthe reciprocation of said jaws, a duplex edge'turning device, and meansfor occasioning the lateral reciprocation of said duplex edge-turningdevice in unison with the movement of the jaws, substantially as setforth.

3. In combination, a pair of cloth holding jaws, a rock arm upon whichsaid jaws are mounted, mechanism for occasioning the vi.- bration orreciprocation of said rock arm, an edge-turning device, and a link orbar connective of said edge-turning device and said rock arm,substantially as set forth.

4. The combination to form a sewing machine attachment, of a plate, apair of clothholding jaws mounted thereon, mechanism for occasioning thereciprocation of said jaws, a duplex edge-turning device, a springtongue upon which said edge turning device is mounted, and mechanism foroocasioning the lateral vibration of said spring tongue, substantiallyas set forth.

5. The combination, to form a sewing machine attachment, of a plate, apair of clothholding jaws, a rock arm upon which said jaws are mounted,a cam, mechanism for occasioning the rotation of said cam, a springtongue mounted upon said plate, a duplex edge-turning device mountedupon said tongue, and a link connective of said duplex edge-turningdevice and said rock arm, substantially as set forth.

. 6. The combination, to form a sewing machine attachment, of a plate, apair of clothliolding jaws, a rock arm upon which said jaws are mounted,and mechanism to be operated by a moving part of a sewing machine foroocasioning the movement of said rock arm, a tongue pivotally attachedto said plate, a duplex edge-turning device mounted upon said tongue,and a link by which said tongue is detachably connected to said rockarm, substantially as set forth.

7. The combination, to form a sewing machine attachment, of the jaws, arock arm upon which said jaws are mounted, the cam, the spring adaptedto force the said rock arm against said cam, the toothed boss, the pawland means for reciprocating said pawl, the spring tongue mounted uponsaid plate, mechanism connective of said spring tongue and a moving partof the mechanism, and a duplex edge-turning device mounted upon saidspring tongue, said device consisting of a pair of mandrels and a pairof curved guides or formers, the rear ends of which guides or formersare exterior to said mandrels, the front ends of which are between saidmandrels, and the intermediate portions of which curve behind saidmandrels, substantially'as set forth.

1 In testimony that I claim the foregoing as my invention I havehereunto signed myname this 3d day of August, A. D. 1893.

HENRY WYNKOOP. In presence of- F. NORMAN DIXON, JAMES LOUGHRAN.

